59b14fe68c
Adding new dashboard code for the Radar CI Dashboard old radar code was moved to the directory scripts Change-Id: I8a588a56aa9fd044826c889813986041fcd142d6
149 lines
4.1 KiB
Python
149 lines
4.1 KiB
Python
# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied. See the License for the specific language governing permissions and
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# limitations under the License.
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import signal
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from multiprocessing import Process
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from threading import Timer
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from oslo.config import cfg
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from radar.tasks.update_systems import update
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from radar.openstack.common import log
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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MANAGER = None
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IMPORT_OPTS = [
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cfg.IntOpt("worker-count",
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default="1",
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help="The number of workers to spawn and manage.")
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]
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def run():
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"""Start the daemon manager.
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"""
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global MANAGER
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log.setup('radar')
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CONF.register_cli_opts(IMPORT_OPTS)
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CONF(project='radar')
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signal.signal(signal.SIGTERM, terminate)
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signal.signal(signal.SIGINT, terminate)
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MANAGER = DaemonManager(daemon_method=update,
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child_process_count=CONF.worker_count)
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MANAGER.start()
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def terminate(signal, frame):
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# This assumes that all the child processes will terminate gracefully
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# on a SIGINT
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global MANAGER
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MANAGER.stop()
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# Raise SIGINT to all child processes.
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signal.default_int_handler()
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class DaemonManager():
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"""A Daemon manager to handle multiple subprocesses.
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"""
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def __init__(self, child_process_count, daemon_method):
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"""Create a new daemon manager with N processes running the passed
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method. Once start() is called, The daemon method will be spawned N
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times and continually checked/restarted until the process is
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interrupted either by a system exit or keyboard interrupt.
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:param child_process_count: The number of child processes to spawn.
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:param daemon_method: The method to run in the child process.
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"""
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# Number of child procs.
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self._child_process_count = child_process_count
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# Process management threads.
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self._procs = list()
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# Save the daemon method
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self._daemon_method = daemon_method
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# Health check timer
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self._timer = PerpetualTimer(1, self._health_check)
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def _health_check(self):
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processes = list(self._procs)
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dead_processes = 0
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for process in processes:
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if not process.is_alive():
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LOG.warning("Dead Process found [exit code:%d]" %
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(process.exitcode,))
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dead_processes += 1
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self._procs.remove(process)
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for i in range(dead_processes):
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self._add_process()
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def start(self):
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"""Start the daemon manager and spawn child processes.
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"""
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LOG.info("Spawning %s child processes" % (self._child_process_count,))
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self._timer.start()
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for i in range(self._child_process_count):
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self._add_process()
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def stop(self):
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self._timer.cancel()
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processes = list(self._procs)
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for process in processes:
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if process.is_alive():
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process.terminate()
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process.join()
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self._procs.remove(process)
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def _add_process(self):
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process = Process(target=self._daemon_method)
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process.start()
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self._procs.append(process)
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class PerpetualTimer():
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"""A timer wrapper class that repeats itself.
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"""
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def __init__(self, t, handler):
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self.t = t
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self.handler = handler
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self.thread = Timer(self.t, self.handle_function)
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def handle_function(self):
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self.handler()
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self.thread = Timer(self.t, self.handle_function)
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self.thread.setDaemon(True)
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self.thread.start()
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def start(self):
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self.thread.start()
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def cancel(self):
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self.thread.cancel()
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if __name__ == "__main__":
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run()
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